...cougars tend to attack from above and behind...very quietly...
Probably true for all the cats. I've watched the same female bobcat hunt in my yard 3 years in a row, every June & July, and she hunts with a combination of lightning speed steps, stealth quietness, and intelligence. She moves quickly and quietly when she figures the prey animal is not looking, and freezes when she figures it might be looking her way. When she moves, she takes a serious of lightning quick steps. And she's smart enough to maneuver to put a big tree between her and the prey while it stalks. Cougar probably hunts similarly, which means unless your head is on a perpetual 360 degree swivel, you won't see the attack coming.